Medicare drug plan shopping may be more important this fall because a temporary federal cushion for stand-alone Part D premiums is ending after 2026.
The Centers for Medicare & Medicaid Services said on July 28, 2026, that it will discontinue the Part D Premium Stabilization Demonstration at the end of calendar year 2026. The agency also released early technical numbers for 2027: a $296.05 national average monthly bid amount and a $41.33 national base beneficiary premium.
Those numbers are not the same as the bill a beneficiary will receive. Actual premiums vary by plan, location, benefits, pharmacy network and any extra help or income-related surcharges. CMS says final Medicare Advantage and Part D plan landscapes, average premiums and other details are expected in mid-to-late September, before Medicare open enrollment runs from October 15 through December 7.
The short answer
If you have a stand-alone Medicare Part D plan, do not assume your 2026 premium, deductible, pharmacy price or drug list will carry into 2027. The benefit itself is not disappearing, and Medicare.gov says open enrollment will still let people join, drop or switch drug plans if they have Original Medicare. The practical task is narrower: check the specific plan notice when it arrives, then compare the total yearly cost of your medicines before the December 7 deadline.
The end of the stabilization demonstration matters because the program was designed to smooth premium volatility after Inflation Reduction Act changes reshaped the Part D benefit. KFF said the extra subsidies reduced average monthly stand-alone prescription drug plan premiums by $26 in 2025 and $16 in 2026, while CMS says plan sponsors now have enough experience under the redesigned benefit to price 2027 plans under traditional market conditions.
Check the premium, not just the headline number
The first mistake is treating the $41.33 base beneficiary premium as your expected monthly payment. CMS describes that figure as the starting point in a statutory formula for calculating plan-specific basic Part D premiums. It is not a plan quote.
When plan documents arrive, compare your 2026 premium with the exact 2027 premium for the same plan. Then compare it with other plans available in your ZIP code. KFF cautions that some stand-alone drug plan enrollees could face larger increases next year, but plan-specific premiums are not known yet. That uncertainty is the reason to wait for the actual plan landscape rather than making a decision from national averages alone.
Look at your medicines one by one
A cheaper monthly premium can still be more expensive over the full year if it puts a regular medicine on a higher tier, adds prior authorization, changes quantity limits or pushes you toward a pharmacy that is inconvenient. Build the comparison around the prescriptions you actually use.
Make a current list with the drug name, dosage, refill frequency and preferred pharmacy. If you use generics, include the exact version on the bottle. If you use a costly brand-name drug, check both the plan formulary and the pharmacy network. Medicare's public plan finder is designed for this kind of comparison, but the result is only as good as the medication list entered.
Do not ignore Medicare Advantage tradeoffs
Some people may look at Medicare Advantage plans with drug coverage if stand-alone Part D premiums rise. That can be a reasonable comparison, but it is not a simple premium swap.
Medicare.gov says open enrollment also lets people switch from Original Medicare to Medicare Advantage, or from Medicare Advantage back to Original Medicare. The tradeoff is that Medicare Advantage plans can have different provider networks, referral rules, out-of-pocket structures and drug benefits. A low drug premium may not be worth it if the plan disrupts a doctor, hospital, specialist or therapy you rely on.
Watch the September plan release
The key date before open enrollment is not today. It is the September release window, when CMS expects final 2027 Medicare Advantage and Part D landscapes and average premium information to become available. That is when beneficiaries can compare real plan choices instead of policy summaries.
Until then, the useful prep is simple: gather your prescriptions, list your pharmacies, note any doctors or hospitals that must stay in network if you are considering Medicare Advantage, and keep the annual notice of change when it arrives. If you receive Extra Help, Medicaid, employer retiree coverage or union coverage, check those rules before switching because different protections or coordination rules may apply.
Common mistakes
- Keeping the same plan because it worked in 2026 without checking the 2027 drug list.
- Comparing premiums but not deductibles, copays, coinsurance and pharmacy tiers.
- Moving to Medicare Advantage for drug coverage without checking medical provider networks.
- Missing the December 7 open enrollment deadline and having changes delayed until the next year.
- Assuming national averages predict the bill for a specific plan in a specific county.
Bottom line
The end of the Part D premium stabilization demonstration is not a reason to panic, but it is a reason to shop carefully. The right question is not whether Medicare drug coverage is changing in the abstract. It is whether your 2027 plan still covers your medicines, at your pharmacy, at a total annual cost you can live with.
